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Mike Parnell Nov 15, 2011 11:07:00 AM < 1 min read

Load Weight Estimation & Area of a Circle

The workshop below uses the Journeyman Rigger's Reference Card panel 6, to help provide the solution.

The area of a circle can be calculated with either (Pi x radius squared) or (dia. x dia. x .80), and both arrive at very similar values for Area of a Circle. For riggers in the field, we use the dxdx.80 method since it is faster and simpler.

If circumference is desired, a person can use Pi x diameter, officially 3.1416 x d, or for quick figuring in the field, 3.2 x diameter.

Happy trails to my crane and rigging friends.

Mike Parnell
ITI – Field Services


area of circle wrokshop